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150                             CHEMICAL ENGINEERING
TABLE 9.—CONVERSION TABLES FOB AIB PBESSUBES
PBESSUBES IN INCHES OP WATEB COBBESPONDING TO OUNCES PEB SQUABE INCH										
Pressure, ounces per square inch	Decimal parts of an ounce									
	0.0	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9
0 1 2		0.17 1.90 3.63	0.35 2.08 3.81	0.52 2.25 3.98	0.69 2.42 4.15	0.87 2.60 4.33	1.04 2.77 4.50	1.21 2.94 4.67	1.38 3.11 4.84	1.56 3.29 5.01
	1.73 3.46									
3 4 5	5.19 6.92 8.65	5.36 7.09 8.82	5.54 7.27 9.00	5.71 7.44 9.17	5.88 7.61 9.34	6.06 7.79 9.52	6.23 7.96 9.69	6.40 8.13 9.86	6.57 8.30 10.03	6.75 8.48 10.21
6 7 8 9	10.38 12.11 13.84 15.57	10.55 12.28 14.01 15.74	10.73 12.46 14.19 15.92	10.90 12.63 14.36 16.09	11.07 12.80 14.53 16.26	11.26 12.97 14.71 16.45	11.43 13.15 14.88 16.62	11.60 13.32 15.05 16.79	11.77 13.49 15.22 16.96	11.95 13.67 15.40 17.14
PBESSUBE IN OUNCES  PEB SQUABE INCH COBRESPONDING TO INCHES OF WATER
Head, inches	Decimal parts of an inch									
	0.0	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9
o		0 06	0 12	0 17	0 23	0 29	0 35	0 40	0 46	0 52
1	0.58	0.63	0.69	0.75	0.81	0.87	0.93	0.98	1.04	1.09
2	1.16	1.21	1.27	1.33	1.39	1.44	1.50	1.56	1.62	1.67
3	1.73	1.79	1.85	1.91	1.96	2.02	2.08	2.14	2.19	2.25
4	2.31	2.37	2.42	2.48	2.54	2.60	2.66	2.72	2.77	2.83
5	2.89	2.94	3.00	3.06	3.12	3.18	3.24	3.29	3.35	3.41
6	3.47	3.52	3.58	3.64	3.70	3.75	3.81	3.87	3.92	3.98
7	4.04	4.10	4.16	4.22	4.28	4.33	4.39	4.45	4.50	4.56
8	4.62	4.67	4.73	4.79	4.85	4.91	4.97	5.03	5.08	5.14
9	5.20	5.26	5.31	5.37	5.42	5.48	5.54	5.60	5.66	5.72
FUNDAMENTAL FORMULAS
Notation.
H = head of air, feet                                                          B ••
h = velocity head, inches of water                              a.hp. =
ht = static head, inches of water                                  b.hp. ••
hi «= impact head, inches of water                                     E •
v = velocity, feet per second                                            N ••
V = velocity, feet per minute                                            D «
W - weight of air, pound per cubic foot, as handled         r ••
P = pressure, pound per square foot                                  b ••
A = area of pipe, square feet                                            M •
a — gross area of fan wheel, square feet                         C\ <
Q = volume, cubic feet per minute                                    T •
4 » volume, cubic feet per second
t = temperature, degrees Fahrenheit
Barometer reading, inches of mercury
air horsepower
brake horsepower
mechanical efficiency
revolutions per minute
diameter of fan wheel, feet
radius of fan wheel, feet
width of fan wheel, feet
manometric efficiency
tip speed, feet per second
tip speed, feet per minute